I endorse this message, this is exactly what I was thinking
It would could go either way. By outing himself or including his bf, they might get canceled on shows or sponsors and eventually commits breach of contract (depends on what it entails) that they have to pay tons for breaching the contract which might exceed their savings. If only that wasn't the case, I was thinking they could freely just out themselves, cancel their contract and go somewhere they are not known or some unknown/small theater just start their life anew.. but alas, reality isn't that easy.
I was already thinking of this possibility as soon as the blackmail thing was introduced long ago, but since the story is so realistic that the possibility of outing themselves could go either way (depending on author's story direction), they could get canceled or fans be happy for them (if fans or audience overall got positive feedback, the sponsors won't cancel, etc. But if they got canceled to the point they eventually commits breach of contract, they have to pay huge amount or have to follow unreasonable orders from above).. If somehow it will be chaotic after the juicy topic, they could either lay low (order from the management) but won't still won't let them go or use them elsewhere (I don't want to imagine the more darker side of the showbiz).
If breach of contract wasn't an issue, they could just leave the company, go incognito after outing themselves and hide on provinces they are not well known or as I have said above, work on small/unknown theater (if they still want to pursue acting) or change career entirely. They're still young and able to work, unless there are paparazzi or avid fans tailing them everywhere and disturb their new life even after quitting showbiz.. (There's no peace in their life if that happens).
That old man's leverage would be gone because I would straight up out myself. Checkmate b*tch. You think I wouldn't sacrifice this career after he sacrifice basically his existence to be by my side? Plus I'm sure he has plenty of money saved as well. However, on that same note though, Shige would probably be devastated if Shin did that because he has sacrificed so much for him to pursue his passion. I would definitely be more concerned about his feelings. But it would actually give him a life back to truly live for themselves. Shin should just tell him he knows and decide what to do together. It's making me sad. That old man and his psycho niece can kick rock...